Description
The CCD observations of the rich open star cluster NGC 2099 and its surrounding field region have been carried out up to a limiting magnitude of V~22mag in B, V and I passbands for the first time. A total of ~12000 stars have been observed in the area of about 24'x24' in the cluster region, as well as ~2180 stars in the ~ 12'x12' area of the field region located ~45' away from the cluster center. The cluster parameters determined by fitting the convective core overshoot isochrones in the V, (B-V) and V, (V-I) diagrams are E(B-V)=0.30+/-0.40mag, distance=1360+/-100pc, age=400Myr and metallicity Z=0.008.
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